Reversing-gear for steam-engines



(No Model.)

1). A. FRAZER. REVBRSING GEAR FOR STEAM ENGINES. No. 439,592. Patented Oct. 28, 1890.

- IN VE/VIOR ZZ 3a 21 id i. Fra er;

A TTOR/VEYS UNITED STATES PATENT OFFICE.

DANIEL A. FRAZER, OF MANGELONA, MICHIGAN.

REVERSlNG-GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 439,592, dated October 28, 1890. Application filed July 28, 1890.' Serial No. 360,213. (No model.)

To all whom it may concern.-

Be it known that I, DANIEL A. FRAZER, a citizen of the United States, residing at Mancelona, in the county of Antrim and State of Michigan, have invented certain new and useful Improvements in Reversing- Gear for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in the reversing-gear of steam-engines; and it consists, essentially, of the arrangement of ports or passages and a rotary valve between the steam chest and cylinder, whereby the engine may be checked down, stopped, airvented, and reversed bya continuous forward movement of a single lever.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of a device embodying my invention; Fig. 2, a horizontal section of the same on the plane of line 3 3 of Figs. 3 and 4; Fig. 3, a transverse vertical section of the same on the line 2 of Figs. 1 and 2; Fig. 4, the same on he line 1 of the same, and Fig. 5 a detail of t e plug-valve G.

Like letters refer to like parts in all the figures.

A is the cylinder; B, the piston; O, the steam-chest; D, the valve 5 E E, the live-steam ports, and E the exhaust-port of a doubleacting steam-engine. Directly beneath the steam-chest is located a rotary valve G, having an annular exhaust-passage H beneath and connecting the exhaust-port E with the exhaust-pipe E and also openings I1 and H, which serve to connect the live-steam ports E E with ports I I at each side of said passages, which open into the chambers I I, which chambers are extended in opposite directions, as shown at F F, and connect with the respective ends of the cylinder A. The opening H is cut across .the upper side of the valve G to receive the steam from E, and opens the side ports I by uncovering them from above downward, the integral part G covering both ports I and the space between them. The opening H is also cut across the top of the valve to receive the steam from E, and is also cut down through the bottom into two parts G G, and opens the corresponding ports I by uncovering them from below upward.

J J are air-vents consisting of channels across the bridge between the live-steam and exhaust ports. These channels are out part way in the upper part of the valve-chamber and the remainder in the valve and are connected and open when in line, which occurs when all the ports I are cut off by bringing the valve in the center, as shown in the drawlugs.

The operation of my device is as follows: The valve D admits live steam alternately to the ports E E, and exhausts the same through E in the usual manner. If, now, the upper side of the valve G is turned to the right, steam passing into ll will pass into the righthand chamber I and thence into the forward end of the cylinder A, and steam passing into H will pass through the opening in the bottom of the same into the left-hand chamber I, and thence into the rear of the cylinder A, and the engine will run in one direction. If, however, the upper side of the valve Gr be turned to the left, the steam will now pass in the opposite direction, the steam from H passing into the left-hand chamber I and to the rear end of the cylinder A, and the steam from II into the right-hand chamber I and into the forward end of the cylinder A, thus causing the engine to run in the opposite direction. By turning the valve G toward the middle position the engine may be throttleddown, and by bringing it to said middle position steam is cut off entirely and the airvents opened, and then by further turning of said valve the motion of the engine will be reversed. Thus steam may be gradually cut off, the engine stopped, air-vented, reversed, and steam gradually let on by a continuous forward movement of a single valve.

What I claim is 1. In combination with asteam-engine having a double-acting cylinder, a D-valve, ports from said Valve to the respective ends of said cylinder, an exhaust-port beneath said valve, a rotary valve, as G, passing through all of said ports, having a permanently-open exhaust passage, and openings permanently II, openings H and H, chambers I at each side of said valve, each having an opening into one end of the cylinder and ports from the 15 openings ll II to said chambers I I, and the air-vent J, substantially as described.

In testimony whereof I aflix my signature 1n presence of two Witnesses.

DANIEL A. FRAZER.

Witnesses:

DENNIS L. Roenns, LUTHER V. MoULToN. 

